Brace-bit chuck.



R. Hi GREEN-HALGH.

BRACE BIT CHUCK.

APPLICATION. FILED ocr. I1. IsIs.

L256A7 5. Paten/06H61). I2, 1918.

2 SHEETS-SHEET B- R. H. GREENHALGH.

BRAcE B11 CHUCK.

APPLICATION FILED 001117.1916. ,2564f?5 Patented 1161.121918.

. 2 SHEETS-SHEET 2- ROBERT H. GREENHALGH, OF SALT LAKE ITY, UTAH.

BRACE-BIT CHUCK.

Specification of Letters Patent.

Patented Feb. 12, ii.

Appli-cation filed Getobe 17, 1915. Serial No. 12,1-55.

To all whom t may concern:

Be it known that l, Ronnn'r H. (innan- HALci-r, a citizen of the United States, residing at Salt Lake City, in the countv of Salt Lake and State of Utah, have invented new and useful Improvements in Brace- Bit Chucks, of which the following is a specication.

The present invention contemplates the production of a chuck, and more particularlv a brace bit chuck.

The salient feature of the invention is the provision of a jaw so designed and associated with the chuck to positively hold the bit within the chuck in such a manner as to prevent any accidental lateral movements of the bit and direct the latter in a perpendicular line through the timber during the boring action of such bit.

To this end, use is made of a j aw embodying spaced faces and so associated within the socket of the chuck to adapt the jaw for a lateral movement, thus upon the movement of the jaw from the socket of the chuck permits of the bit tang being inserted or extracted from the socket of the jaw.

A still further obiect of the invention resides in the provision of a novel means for locking the jaw against movement with respect to the chuck head. thus upon the boring operation of the bit the said locking means is held against movement and prevents the tang from having any loose movement in the iaw.

lVith the above and other objects in view, the invention consists in the novel features, details of construction and combination of parts which will hereinafter be more fully set forth, illustrated in the accompanying drawing and pointed out in the appended Claims.

Figure 1 is a view in side elevation of an ordinary brace showing the iaw associated with the chuck head and in closed position, the locking means for the jaw being illustrated in section;

Fig. 2 is a side elevation of a slight modified form of chuck head used in connection with boring machines. the locking means being illustrated in released position and with the jaw shown in a released position, the bit tang being illustrated as secured to said jaw:

Fig. 3 is a section on line 3--3 of Fig. 1;

Fig. 4 is a rear elevation of the form of chuck head shown in Fig. 2 of the draw-s ing, the locking means shown in locked position, the j aw being illustrated in iccked' n in showi i l use ou locking means shown in Fig. l of the drawins;

Fig. S is a detail perspective viev;Y of the locking means shown in Figs. Q, et. and 6 of the drawing; and

Fig. 9 is a side elevation of a further modified form of chuck showing the jaw as being slidably associated with the chuck instead of pivotally connected thereto.

in the accompanying drawing, reference being had more particular-i37 to Fig. l, denotes the U-shaped brace provided with a chuck 5 having its shank 6 securely fastened in the opening 7 formed terminallj,Y on the arm B of the brace.

The chuck in all forms of the invention, with the exception of Fig. 9, is provided with a socket 8 having its walls 9 iiared in a direction toward the lower end of the chuck and the base portion of the socket, designated bv the reference character 10 is 0f substantiall7 rectangular form in cross section. The point of formation of the shank 6 with the chuck 5 presents a downwardly beveled shoulder 1l, the purpose of which will be hereinafter more fully set forth as the description of the invention is proceeded with. A pin 12 passes through the walls forming the rectangular base portion l0 of the socket, and through the rectangular shank l of the jaw i5 serving to pivotallv connect said jaw in the socket 9 of the chuck and adapting the saine for a lateral swinging movement, better shown in Fig. 2 of the drawing. The said jaw l5 is of substantially wedge-shaped or tapering formation, whereby when the jaw is in closed position, that is to sav, when said jaw is swung between the walls of the socket 9, the same will snugly lit therebetween, and to an extent prevent any loose movement of the i aw with respect to the chuck.

The character 16 denotes a locking member for the jaw and used in connection with the brace bit chuck, as illustrated in Figs. l and 7 of the drawing, and this form of locking means embodies a hollow sleeve 17. One of the walls of the material forming the sleeve is extended to provide a retainerV 18. Provided on the outer surface of the upper inwardly beveled portion 19 of the retainer is a laterally extending manipulating portion 20. In use of the form of locking member above referred to, .after the jaw 14 has been swung to a closed position, previous to which the recess 21 or" the bit tang 22 is reposed on the toothed extremities 23 formed on the extremities ol2 the spaced legs 24 of the jaw, upon the insertion of the bit tang within the socket 25 of the jaw, the jaw being thence closed and the locking member 16 is moved downwardly on the chuck to embrace the jaw, after which the beveled portion 19 of the retaining member co-acts with the beveled portion 11 of the chuck and is lodged under the arm B of the U-shaped brace A. Due to this manner of locking the retaining member on the chuck, the said retaining member will be positively prevented from moving lengthwise of the chuck upon the boring action of the bit.

The locking member 26 illustrated in Figs. 2, 4, 5, 6, 8 and 9 of the drawing is illus trated as embodying a hollow cylindrical sleeve provided at its upper end with an inwardly flattened beveled portion 27 yadapted to repose on the beveled portion 11 of the chuck, and when this beveled portion 27 of the sleeve is brought into registration with the fiattened portion 29 of the chuck head, the locking member will be partially rotated, and due to this operation, will lock the locking member on the chuck and prevent movement thereo-f longitudinallyy of said chuck. The upper extremity of the shank 14 of the jaw 15 is provided with an outwardly and downwardlv beveled portion 25 adapted to engage with a similar beveled portion 26 formed on the base of the, socket 9, to permit the swinging of the jaw 15 in an outward and lateral direction, and controlling the swinging of the Jaw in only one direction with respect to the socket.

The modified form of invention illustratedv in Fig. 9 of the drawing shows thebase portion of the socketbeing of substantially circular form in cross section, and designated by the reference character 28, adapted to receive the substantially cylindrical bulged portion 29 formed on the free extremity Copies of this patent may be obtained for method of operation of the invention will be readily apparent to those skilled in the art to which the'invention relates, and while I have described the principles of operation of the invention, together with the device which I now consider to be the best embodi-V ment thereor, I desire to have it understood that the device shown is merely illustrative, and that such changes may be made when desired as are within the scope of the claims appended hereto. d

I-Iaving thus described the inventiomwhat is claimed is:

1. In combination with a chuck providedY with a shank, the point of vformation of the shank with the chuck presenting a beveled peripheral portion, a jaw associated with the chuck for receiving therein the bit tang, means for connecting the jaw with the chuck ierV lateral movement, a locking member `for holding said j aw against` movement.l and means formed on the upper portion of said locking member and adapted` to engage with the beveled peripheral portion of the chuck to prevent movement of said locking member during the turning action'of the bit.

2. A device of the character set forth embodying a chuck provided with a tapering socket, a jaw of a configuration conforming.

with the socket of the chuck and mounted therein for lateral movement, said'j aw comprising spaced legs formed with toothed extremities and the spacingl of the legs forming the liaw with a socket adapted to receive the bit tang therein, the tang of the bit ref posing upon the toothed extremities of the legs and preventing any accidental displace Y ment of the bit from said jaw -when the latter is in a closed position, 'and meansifor locking the said jaw against any accidental lateral movement with respect to said socket.

In testimony whereof I ailix my signature.

ROBERT H. GREENHALGH.

five cents each,` by-addressing the Commissioner of Tatents,`

Washington, D. C. 

